129825837 has 12 divisors (see below), whose sum is σ = 193993020. Its totient is φ = 83565888.

The previous prime is 129825811. The next prime is 129825851. The reversal of 129825837 is 738528921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68657796 + 61168041 = 8286^2 + 7821^2 .

It is not a de Polignac number, because 129825837 - 2⁸ = 129825581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129825792 and 129825801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129825887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248448 + ... + 248969.

It is an arithmetic number, because the mean of its divisors is an integer number (16166085).

Almost surely, 2^129825837 is an apocalyptic number.

It is an amenable number.

129825837 is a deficient number, since it is larger than the sum of its proper divisors (64167183).

129825837 is a wasteful number, since it uses less digits than its factorization.

129825837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497452 (or 497449 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 129825837 is about 11394.1141384489. The cubic root of 129825837 is about 506.3533766028.

The spelling of 129825837 in words is "one hundred twenty-nine million, eight hundred twenty-five thousand, eight hundred thirty-seven".